THE QUANTITATIVE ESTIMATION OF THE PROTEI N-CONTENT IN MILK BY MEANS OF ULTRAVIOLET SPECTRAL PHOTOMETRY .7. THE MILK ANALYZER MAG-100 (CARL-ZEISS-JENA-GMBH) AS POSSIBILITY FOR SIMULTANEOUS MEASURING OF THE PROTEIN AND FAT-CONTENT IN RAW-MILK ON THE DAIRY FARM

A new analysing apparatus is introduced, which allows to measure prote in and fat contents of milk in the dairy farm. The instrument works on the basis of ultraviolet spectral photometry. Before measuring the mi lk sample must be diluted with a hydrous detergent solution in the rat io 1:100 and then homogenized. Accuracy and precision of the analytic results are influenced by detergent type, the water quality of deterge nt solution, the detergent foam, the air content and the pH of deterge nt solution, the reliability of homogenizer and thermostating system, the stability of photometer and by the error of dosage. Also a milk st andard was developed, which is required for daily calibration of the a pparatus.